BESS【5】FAQ for troubleshooting

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Where are logs and error messages stored?

Look in /tmp/bessd.INFO, /tmp/bessd.WARNING, and /tmp/bessd.ERROR

My pipeline isn’t providing the right output. How do I tap the packets being forwarded in BESS?

BESS supports tcpdump on all module input/output gates. To do this, type tcpdump [in|out] [gate number] [any tcpdump flags/args you want] in bessctl. For example,

localhost:10514 $ tcpdump port_inc0 out 0 -ne | less

will show packets, including their Ethernet header. | less was used to not drown by tons of packets.